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IEC 60332-3/BS 4066-3 (Flame Test On Bunched Wires/Cables)
IEC60332-3C describes a method of type approval testing to define the ability of bunched cables to resist fire propagation. In this test, a cable specimen, consisting of number of 3.5m length of cables are fixed to a vertical ladder tray where they are applied with a flame from a gas burner for a specified times under controlled air flow. Four categories (A, B, C & D) are defined and distinguished by test duration and the volume of non metallic material of the sample under test. The cable specimen is deemed to have met the requirements of the standard if, after burning has ceased, the extent of charred or affected portion does not reach a height exceeding 2.5m above the bottom edge of the burner.
(https://www.cabledatasheet.com/thumbnails/1v06-37.jpg)
https://www.cabledatasheet.com/pdf/1v06-37.pdf